Aladfar


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. Combined General Catalogue of Variable Stars (suspected variables)


catalogues and names Aladfar, h Lyr, NSV 11839, 20 Lyr, HR 7298, HD 180163, SAO 68010, WDS 19138+3909A
constellation Lyra

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

note (category: star names): Aladfar.

position, motion, parallax:

position (J2000) RA: 19h 13min 45,5sec DEC: +39 8' 46''
position (J1900) RA: 19h 10min 21,2sec DEC: +38 58' 26''
proper motion (J2000) RA: 0,004 arcsec/a DEC: 0,002 arcsec/a
radial velocity -8 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible
rotational velocity 24 km/s (uncertain) (variable)
trigonometric parallax 0,002 arcsec

magnitude

visual magnitude 4,39
(V on UBV Johnson system)

spectral / color information

spectral class B2.5IV
B-V-magnitude -0,15
U-B-magnitude -0,65
R-I-magnitude -0,15

variability information

variable star identification 11839

double/multiple star system information

number of components of multiple star system 3
separation 28,3 arcsec
mag difference (of double or brightest multiple) 4
component ID AB
note (category: double and multiple data): B is A0, optical.
note (category: spectroscopic binaries): 56.4d. K 2.8, V0 -8.9, asini 1.841.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 19h 13min 45,487sec DEC: +39 8' 45,7'' 0,35 arcsec source: 17
proper motion (J2000) RA: -0,0001 arcsec/a DEC: 0,003 arcsec/a source: 25
radial velocity -8 km/s source: 25
trigonometric parallax 0,002 - source: 25
galactic coord. (B1950) longitude: 70,62 latitude: 12,75
GCI unit vector (J2000) X: 0,245306 Y: -0,735722 Z: 0,631299

magnitude:

visual 4,39 (observed) source: 25
photovisual 4,5 source: 2
photographic 4,3 source: 16

spectral information:

spectral class B3 source: 96
Morgan-Keenan B2.5IV source: 25
B-magnitude 4,24 0,05 B-V-magnitude -0,15
U-magnitude 3,59 0,05 U-B-magnitude -0,65

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 28,3 arcsec
magnitude difference between brightest and second brightest component 4,2
position angle 81

component magnitude spectral class catalogue(s)/name(s)
A 4,39 B3 Aladfar, h Lyrae, 20 Lyr, HR 7298, HD 180163, SAO 68010
B 8,58 -

sources:

2 HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
16 PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
17 ACRS
Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991
19 WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25 Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
96 SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 19h 12min 3,29sec DEC: +39 3' 32,09'' 0,014 arcsec
position (J2000) RA: 19h 13min 45,518sec DEC: +39 8' 45,68''
proper motion J1950 (FK4) RA: 0 arcsec/a DEC: 0,003 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0003 arcsec/a DEC: 0,002 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4,5 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class B3
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

source catalogue GC, catalogue number: 26507
Durchmusterung BD+38 3490
Boss General Catalogue 26507
Henry Draper Catalogue 180163

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 19h 13,8min DEC: +39 9'
proper motion (J2000) RA: -0,001 arcsec/a DEC: 0,003 arcsec/a

double/multiple star system information:

component year number of measures position angle angular separation magnitude of 1st component magnitude of 2nd component spectral class(es) discoverer code
AB 1830 33 85 27,9'' 4,38 8,58 B2.5IV STF2487
1969 81 28,3''
AC 1880 2 151 161,3'' 4,5 11,1 - STF2487

discoverer information:

discoverer code discoverer reference
STF2487 Struve, F.G.W. -

notes:

note Eta Lyr. B is BD+38@3491. Proper motion of B -008 -001. A is a spectroscopic binary.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (J1950) RA: 19h 12min 3,3sec DEC: +39 3' 32''

variability informations:

magnitute at max. brightness 4,36
magnitute at min. brightness 4,44
photometric system visual, photovisual or Johnson's V

spectral information

spectral class B2

references

to a study 122629D (designation: ETA LYR)

miscanellous

There are notes in the published catalog (Kukarkin et al.(1982)).